The damselfly genus Mecistogaster (Odonata: Pseudostigmatidae) from the Brazilian Atlantic Forest with a description of three new species and a neotype designation for M. amalia (Burmeister, 1839) Author Soldati Lacerda, Déborah S. Author Monteiro Machado, Angelo B. text Zootaxa 2019 2019-09-10 4668 2 207 228 journal article 25488 10.11646/zootaxa.4668.2.3 49eab955-d6ae-4253-bae3-ab650f77fcfc 1175-5326 3449229 F41E013A-A2B0-4642-AED6-27777DA950B5 Key to males of Mecistogaster recorded in the Brazilian Atlantic Forest 1. Costal margin at level of pseudostigma of HW not projected anteriorly; cerci in lateral view straight........... M. linearis 1’. Costal margin at level of pseudostigma of HW abruptly projected anteriorly ( Fig. 12 ); apex of cerci in lateral view bent ventrally ( Fig. 28 )........................................................................................ 2 2. Anterior hamule with alula ( Fig. 17 )...................................................................... 3 2’. Anterior hamule without alula ( Fig. 18 ).................................................................... 4 3. Mesepimeron totally reddish-brown ( Fig. 9 ); penis segment 2 in ectal view with one lateral elevation, in lateral view with contour foot-shaped ( Figs 23, 24 ).................................................................... M. amalia 3’. Mesepimeron with reddish-brown area restricted to lower 1/5 of sclerite ( Fig. 8 ); penis segment 2 in ectal view with two lateral elevations, in lateral view with contour not foot-shaped ( Figs 25, 26 )........................... M. nordestina sp. nov. 4. Mesepimeron with reddish-brown area restricted to lower 1/5 of sclerite ( Fig. 8 ); contour of penis segment 2 in lateral view with dorsal and ventral margin straight ( Fig. 22 ), apex of inner fold projected ventroapically as a tubercle ( Fig. 22 )........................................................................................... M. kesselringi sp. nov. 4’. Mesepimeron totally reddish-brown ( Fig. 9 ); contour of penis segment 2 in lateral view with dorsal margin undulated and ventral margin with a semicircular elevation at midlength ( Fig. 20 ), apex of inner fold hardly visible, not projected ventroapically ( Fig. 20 ).............................................................................. M. mielkei sp. nov.